Anchoring means for adjustable backs of metal chairs



Oct. 21,1952 H. r. HALLOWELL, JR., EI'AL 2,

ANCHORING MEANS FOR ADJUSTABLE BACKS 0F METAL CHAIRS Filed Feb. 2. 1951 LICI. i

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ZMZZoweZZ +WMICM- W5 hnj wrvd W side pieces -member secured at its corners to r n r of thelegs l3 and comprising side members l1 j a rear member seat element 1 I,

"vided with a Patented o er 21, 1952 madame MEANS FOR ADJUSTABLE BACKS or METAL CHAIRS HowardT.

l Pressed Steel 00.,

' Application February "The present invention relates'to occupational chairs, and moreparticularly to means for horiz'ontallyadjusting the back rest of such chairs with respect tothe seat.

Aprimary object chairs of the stated type and back support in the support positively in adfor maintaining dusted position. i I

- To the latter end the invention". contemplates provision of a novel form of clamp, said clamp being positive in action, non-mutilative of the chair. parts with which ciated, readily releasable for I back, proof against inadvertent displacement while the back is in normal f my invention is to provide a. generally improved means for adjusting the nauoweu, 11 Rydal, nett, Philadelphia, Pa., assignors Jenkintown,

v tion oilenns'ylvania 2, 1951,; Serial Na. 2 09,116.

5 j i 7 Claims. (01. 155-157) it is immediately assoadjustment of the 1 assembly with the frame of the chair, and susceptible of production at low cost x r I In theiaccompanying drawings,

Fig. -l is a perspective viewof a chair employing clamping means according to myjinvention;

Fig. 2 is a fragmentary rear perspective view Fig. 31s a n of the seat structure of the chair; and

Fig. 4 is an exploded perspective view of the clamp element.

of the chair; I

fragmentary sectional view "Referring more particularly to 'the drawings, the illustrated chair comprises a base structure I l0,a seat element ll, and a backrest l2 adjustal4, said sup-' bly mounted: on a U-shaped support port comprising an upper cross p ece l6, lfispaced tend horizontally under the seat element ll.

a rectangular The. base structure in includes the upper ends l5 and two and I8, a front member 19 and 20. The side members l1, and I8 support the as indicated at 2|, 2| in Figs. 1, 2 and 3; and the frontand rear members are perforated at 22, 22 and.23,. reception of the horizontal of the side pieces l6, l6 .of the support'fmemberM; I The support jmember I4 is anchored in the frame ill by means of clamps 24, 24 one of which is illustrated in Fig, 4. Each'clainp of a split sleeve 25 adapted to embrace one of the side pieces 16, said sleeve-being provided with, radial flanges 26 and 21 one at each side of said split. Near one end, the sleeveis protransverse 26 and the. front member width to, receive apart and shaped to ex--.

IQ of the ward member 20, may

, back rest l2 bears clamps cannot occur.

.3 the side pieces of the and Frank Bento Standard Pa., 2. corporaframework. .Near provided with mutually-aligned square apertures 29 and 30 located in'the flanges 26 and 21 respectively, said. apertures being adapted to .re- :ceive thesqua're'sha'nk of a carriage bolt -3l. 'A'

threaded shank i 'of the bolt 3i, to contract'an'd thereby clamp the leeve nut 32 coacts with the insertion through perforations 23, 23 in therearv be passed into the-sleeves 250i the clamps 24 and through the perforations 22, 22 inthe forward member l9 to the position, shown in Figs.'1 and a desired relation to theseat H. The carriage bolts 3! are then tightened to fix the clampsto the side-pieces l6, l6 and to thereby anchor the back support M inthe chair frame; Subsequent adjustment of the back support in a horizontal ening the nuts 32, sliding, the support through the bolts; i

Obviously, the clamps cannot separate from the assembly until" theback support hashbeen removed so that inadvertent displacement of the "It will be apparent also that the .manner in which the clamp engages --ber IQ of the frame precludes mutilation of either 23 respectively for i lower end portions the seat frame; and a clamp comprising acs'leeve anchor the'clamp being provided with a slot 28 which extends of the engaged elements andinsures against functional deterioration. v

We claim;

' 1. In a chair comprising a seat and a back rest,

a seat frame-having perforated members near the front and the rear of the seat-respectively, a i

support for theback rest having side pieces extendingunder the seat and freely'thr'ough the perforations in the back and front members of split lengthwise and pfrtiallyopened to loosely of. the back supextending outwardly at each side. of said split,

transverse slot. adapted for reception of one of the perforated'members ofthe seat frame, said slot intersecting the sleeve depth to afiord registration 1 and being of suificient the other end, the clampis support to the chair, is

the sleeve portion 25 reg- 3 for example, wherein the a direction is efi ected'by loosand retightening back support and the memof the sleeve with one of the said perforations in the frame member of the back support is passed through the perforation and through both parts of the sleeve at the opposite sides respectively of the frame member, and the pressure exerting meansis then tightened to. contract: the be maintained in interlocking engagement with the'frame member side piece in the frame.

2. A chair according to claim lincludingiasecnd clamp of the character described'arranged side piece :of-"sa'id. support" W and to interlock with the perforated. frame memeber so as to immobilize the side piece with r'eto embrace the other spect to the frame.

3. A chair according to claim z-whereln each of said clamps interlock with the said" front member of the seat frame.

4. A chair according to claim 3 wherein the said slotjis injproximitx'to the end of said clampii whichprotrudes outwardly from said seat frame;

5. A chair according to; claim 1 wherein said whereby when the sidep-iecesleeve, the clamp" will.

and will immobilize the said;

flanges are; provided? withmutually aligned apertures to receive-- the: said pressure-exerting means and; wherein. further,the;, said means comprises aanlll landa bolt coacting through said apertures to efiect contraction of the sleeve.

HOWARD T. HALLOWELL, JR; FRANK BENNETT.

' REFERENCES CITED The following references are of record inthe file of this. patentz- UNITED STATES PATENTS Number Name I Date 818,293 Rich c l. rA rv 17, 1906 884,772 Sorensen. n- Apr. .-14," 1-908v 1,997,486- I-Iallowellr, .'Apr. 9, v FOREIGN PATENTS I Number 7 Country" Date France; 

